Question
Peter has some black and pink beads. The total mass of all his beads is 207 g. He has 9 less black beads than pink beads. The average mass of the black beads is 7 g. The average mass of the pink beads is 11 g. How many beads does Peter have altogether?
3 m

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Peter has some black and pink beads. The total mass of all his beads is 207 g. He has 9 less black beads than pink beads. The average mass of the black beads is 7 g. The average mass of the pink beads is 11 g. How many beads does Peter have altogether?